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Mognet

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Everything posted by Mognet

  1. Downloaded it last night and had a quick play. Just watched a batch of tutorial videos and it looks quite good. Only thing that seems to be missing compared to FreeCad and Fusion 360 is constraints in sketching. I initially found them frustrating, but they are also useful at times Also has constraints, which are not on by default but need to be enabled in settings
  2. OpenSCad is good but slow, and designs can take some thinking about. FreeCad I find frequently frustrating. Fusion 360 is brilliant, but takes ages to load on my laptop. Updates are worse as they can take 30+ minutes
  3. Visual design tools are much easier to use. I chose OpenSCad over FreeCAD for this project as I didn't have the patience to get threads working
  4. That's ok. Perhaps I should have used this photo originally. It shows the whole thing with the camera too That rod could be a problem. I don't think it needs to be that long either, and at larger angles the mount may not be able to cope with the shifted weight. I'll see if I can come up with something stronger and more stable that can still be adjustable Thanks. I used OpenSCad for the design, and the thread uses this bit of code. It creates a 2D shape of the cross section of the thread and the extrudes and rotates it module adjustment_thread(height, threadTolerance = 0) { threadDepth = screwThreadDepth - threadTolerance; innerRadius = rScrewThread - screwThreadDepth - threadTolerance; function ra(x, z) = [x * sin(360 * z), x * cos(360 * z)]; input = [ for (lp = [0:0.05:1]) ra(innerRadius + (threadDepth * lp), lp / 4), for (lp = [0:0.05:1]) ra(innerRadius + threadDepth, 0.25 + lp / 4), for (lp = [0:0.05:1]) ra(innerRadius + (threadDepth * (1 - lp)), 0.5 + lp / 4), for (lp = [0:0.05:1]) ra(innerRadius + 0, 0.75 + lp / 4) ]; translate([0, -adjustmentBlockPlateLength, offsetToTop - bodyThickness / 2]) rotate([0, 180, 0]) linear_extrude(height = height, twist = -(height/(screwThreadDepth*4)*360)) polygon(points = input); }
  5. Same here, even if to only experiement with I'm curious as to how they perform. I couldn't find anything with a quick search, but if they are going to be using one in a satellite then they must perform well
  6. The YouTube recommendation algorithm brought this up, a monolithic Schmidt-Cassegrain, and it's tiny! Rik ter Horst has been making these by hand for a while
  7. Hi, That's ok. It basically converts the alt-az mount into an equatorial mount, so what is normally the vertical axis (the azimuth axis) becomes the equatorial axis Alignment is crude. The camera is set parallel to the equatorial axis using the markers that were already on the mount, and then the mount is roughly aligned with Polaris. After that the handset controls are used to point the camera at the appropriate patch of sky, and the mount rotation should match that of the stars Thanks. I did consider creating a fixed angle version, which would have been fine for my use, but I wanted to share it with the community too so opted for the adaptable version. The hinge seems to take most of the weight, so I think it's fairly safe. I wouldn't trust it with anything more than the weight of my camera and 70-300 lens, i.e. less than a kilo
  8. Thanks I don't think that's an option for this mount. Certainly nothing obvious from looking at their site and I didn't see anything in the handset menu for it
  9. Thanks. 3D printing is quite capable of things like this, and more too. Several members here use 3D printing for lots of things, including clocks, telescopes and rockets for display The biggest of the telescopes. Chriske has made several different types Rocket for display, also by Chriske And one of Gina's clocks
  10. Hoping the skies stay clear tonight so I can test version 2 I adjusted some of the dimensions and took out the nice curves that fitted the base as they were a bit of a pain to place properly and their positions weren't calculated. The result isn't quite as pretty but it will still work. This version was printed and set up about a month ago and there doesn't seem to be any warping of the PLA so far, unlike the previous version. There is a wobble in the adaptor which seems to be due to play in the adjustment screw and mounts. I might also need to boost the thickness of some parts too
  11. The booster landing is always amazing to watch
  12. Have made a minor update to take it to v1.2.6 This time I found that surplus jpg files were not being deleted before new movies were created. I'd turned off the power here without shutting down the cameras cleanly first and a jpg file wasn't added into the daytime movie that day, but was left hanging around. That meant it kept getting added in at the start of every daytime movie as that part uses a wildcard add rather than named file. The code to clear the surplus files relied on a wildcard which doesn't seem to work with a file delete in Bash, even though it does from the command line
  13. Next Blue Origin launch is scheduled for 14:00 UTC Wednesday having already been postponed due to wind https://www.blueorigin.com/
  14. Pete @astrolunartick has made several lightweight scopes for backpacking that show what can be achieved
  15. I'm curious as to what you will make next. Your build threads are fascinating
  16. That's better And the finished rocket looks fantastic. Well done to all involved
  17. I got the alert on Friday night too. First one I've seen in the four years I've had the app. Went outside to check and it was completely clouded out. As is typical the sky started to clear again once the alert level was back down to yellow
  18. Seems to be an issue with the link. I get the same message too
  19. The Register interviews Brent Waller, one of the designers. Apparently it's 99.8% accurate on relative timing https://www.theregister.com/2021/09/15/lego_solar_system/
  20. Looks good. Glad you're getting on with it and you got your MQTT input sorted I know what you mean about the clear skies and full moon. Went out to check the skies last night and Jupiter was sparking, but the full moon washed everything else out. Tonight had been promising until about ten minutes ago when clouds rolled in again I didn't bother updating the about page with the last change as v1.2.5 only affected the install scripts. They'll be realigned with the next change
  21. Does it work if you set it to manual exposure? My D3100 and D3400 refuse to take photos when attached to the scope if I haven't set that
  22. Last night was the first decent clear night here in ages so I took some time to experiment with the wedge. And it does work. Took some thinking about and a little swearing The SynScan alt-az software isn't designed to be used like this so initial attempts at using star alignment had to be ditched. Either it wouldn't align, or it would give alignment stars I couldn't see, or it would cause trailing. It seems the way to do it is to set the location to 90 degrees north (or south if you're in that hemisphere) and then skip the star alignment. Target alignment can then be done by guesswork and trial photos. The camera stayed pretty much with the chosen star field for the twelve minute period I was shooting in. These are 200x200 pixel crops from the top left corner of the first and last images. For a first test and for my purposes it's acceptable This is the result from last night once I'd figured most things out. It's shot on a Nikon D3100 with a Nikkor 35mm 1.8G lens, 22 subs of 30 seconds each, F4, ISO1600, no darks or flats, processed roughly in Sequator and GIMP I would have taken more subs, but the camera battery ran out of power after those 22. Which led me on to a problem I was expecting. My print sizing isn't quite correct so the holes in the wedge don't engage with the teeth in the mount and it seems that friction alone cannot be relied on to keep the wedge in place so when I went to change the battery the whole thing rotated. I definitely need to modify that part of the design, and I think I'll just make up an adaptor for my existing one as that piece was a ten hour print
  23. Thanks. My designs vary between crazy and good, and I think this one could be one of the good ones I've not seen one of those before, but it is quite similar I noticed that when servicing the mount a few years ago. I was never quite sure I put the right tension on the azimuth nut when I put it back together. It's possible that I may not have set it tight enough
  24. As I'm being a bit tightfisted economical with my money at the moment, I thought I'd experiment with adapting my old style SkyWatcher SynScan alt-az mount by designing and printing a wedge to enable me to experiment a bit more with astrophotography. I'm not expecting it to be hugely accurate, just vaguely. But if I can get it to follow the same patch of sky to get 30 second exposures with my longer camera lens and without trails then I'll be happy. I seriously doubt it's strong enough to take the weight of a scope though. I haven't tried it out yet as I'm waiting on a clear sky, but I have mounted a camera and rotated it using the controls. There is some slippage in the mount in a couple of places which isn't unexpected as the balance is off, and there is some flex in it as it's only printed in PLA with 30% cubic infill I'm not publishing the plans yet as it's still a prototype. I know already there are some small changes that need to be made. The teeth on the original mount don't mesh with the holes in the print so might cause further slippage, and I need to tidy up a few other dimensions Hoping that this is actually a practical idea instead of one of my usual bonkers ones!
  25. I've found a list of four clubs in Suffolk http://www.astronomyclubs.co.uk/Clubs/Default.aspx?CountyId=67 Orwell Astronomical Society will be the closest to Hadleigh
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